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<head><meta charset="utf-8"><title>weekly meeting 2019-08-29 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html">weekly meeting 2019-08-29 #54818</a></h3>

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<a name="174454059"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174454059" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174454059">(Aug 29 2019 at 13:34)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>; the triage meeting will be starting in 30 minutes</p>



<a name="174454146"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174454146" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174454146">(Aug 29 2019 at 13:35)</a>:</h4>
<p>I will be doing <a href="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-08-29.20.2354818" title="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-08-29.20.2354818">pre-triage in a parallel topic</a></p>



<a name="174454357"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174454357" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174454357">(Aug 29 2019 at 13:37)</a>:</h4>
<p>Today's working groups are:</p>
<ul>
<li><span class="user-group-mention" data-user-group-id="491">@WG-nll</span> -- perhaps <span class="user-mention" data-user-id="116118">@Matthew Jasper</span> is around? Otherwise, <span class="user-mention" data-user-id="126931">@centril</span> or I can give an update. </li>
<li><span class="user-group-mention" data-user-group-id="1117">@WG-parallel-rustc</span> -- I don't think <span class="user-mention" data-user-id="116010">@Aaron Turon</span> is around. I guess <span class="user-mention" data-user-id="116466">@Zoxc</span> and/or I can give a brief update.</li>
</ul>
<p>Last week (which we missed) was, if anybody would care to give brief updates on these topics:</p>
<ul>
<li><span class="user-group-mention" data-user-group-id="1095">@T-compiler/WG-meta</span> </li>
<li><span class="user-group-mention" data-user-group-id="1162">@WG-mir-opt</span></li>
</ul>



<a name="174454379"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174454379" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174454379">(Aug 29 2019 at 13:37)</a>:</h4>
<h1>Announcements</h1>



<a name="174454401"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174454401" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174454401">(Aug 29 2019 at 13:38)</a>:</h4>
<p>In the run-up to the meeting, feel free to leave announcements, but try to keep discussion relatively minimal to help ensure everyone sees the updates themselves. :)</p>



<a name="174456522"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456522" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456522">(Aug 29 2019 at 14:01)</a>:</h4>
<p>Hello <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> -- triage meeting starting now</p>



<a name="174456541"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456541" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456541">(Aug 29 2019 at 14:01)</a>:</h4>
<p>Feel free to leave announcements for the next few minutes as folks arrive</p>



<a name="174456611"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456611" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456611">(Aug 29 2019 at 14:02)</a>:</h4>
<p>I'll do wg-mir-opt updates</p>



<a name="174456724"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456724" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456724">(Aug 29 2019 at 14:03)</a>:</h4>
<p>OK, let's get started I guess.</p>



<a name="174456799"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456799" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456799">(Aug 29 2019 at 14:04)</a>:</h4>
<p>First off, in the pre-triage effort, I didn't even manage to make it through the list of nominated issues.</p>



<a name="174456803"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456803" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456803">(Aug 29 2019 at 14:04)</a>:</h4>
<p>So we may return to that later on :)</p>



<a name="174456825"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456825" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456825">(Aug 29 2019 at 14:04)</a>:</h4>
<p><em>But</em> we did see something of a trend. There were at least two issues that seemed to be due to an LLVM upgrade:</p>
<ul>
<li><a href="https://github.com/rust-lang/rust/issues/63959" target="_blank" title="https://github.com/rust-lang/rust/issues/63959">#63959</a></li>
<li><a href="https://github.com/rust-lang/rust/issues/63791" target="_blank" title="https://github.com/rust-lang/rust/issues/63791">#63791</a></li>
</ul>



<a name="174456953"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456953" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456953">(Aug 29 2019 at 14:06)</a>:</h4>
<p>We've talked on and off about this idea of an "ICE-breaker" effort -- I think it would make sense to try and "repurpose" <span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span> to help out with tracking and resolving this issues? This probably doesn't mean that much but maybe we can promote the concept and get a few more people beyond <span class="user-mention" data-user-id="133224">@Nikita Popov</span> and <span class="user-mention" data-user-id="123586">@nagisa</span>, and create an official github team so it can be easily cc'd</p>



<a name="174456967"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174456967" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174456967">(Aug 29 2019 at 14:06)</a>:</h4>
<p>I'm not even sure if this is <em>repurposing</em> exactly</p>



<a name="174457015"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457015" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457015">(Aug 29 2019 at 14:07)</a>:</h4>
<p>it seems in line with the WG's current goals</p>



<a name="174457024"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457024" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457024">(Aug 29 2019 at 14:07)</a>:</h4>
<p>Anyway assuming nobody objects I'm going to try to do that later on :)</p>



<a name="174457045"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457045" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457045">(Aug 29 2019 at 14:07)</a>:</h4>
<p>I think this mostly means creating the GH team and making an announcement asking for folks who are interested to "sign up" for notifications</p>



<a name="174457053"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457053" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457053">(Aug 29 2019 at 14:07)</a>:</h4>
<p>OK, moving on.</p>



<a name="174457095"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457095" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457095">(Aug 29 2019 at 14:08)</a>:</h4>
<p>(If this works out, maybe that's something we can do more of -- creating "ICE-breaker" teams focused on particular areas of the compiler)</p>



<a name="174457170"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457170" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457170">(Aug 29 2019 at 14:08)</a>:</h4>
<p>So let's look at </p>
<h1>Beta Nominations</h1>



<a name="174457182"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457182" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457182">(Aug 29 2019 at 14:08)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler">List of nominated PRs</a></p>



<a name="174457233"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457233" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457233">(Aug 29 2019 at 14:09)</a>:</h4>
<p>I'm going to write out the nominated PRs one after the other, then people can add emojis, and/or leave comments about particular PRs</p>



<a name="174457234"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457234" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457234">(Aug 29 2019 at 14:09)</a>:</h4>
<blockquote>
<p>Account for doc comments coming from proc macros without spans <a href="https://github.com/rust-lang/rust/issues/63930" target="_blank" title="https://github.com/rust-lang/rust/issues/63930">#63930</a></p>
</blockquote>



<a name="174457245"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457245" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457245">(Aug 29 2019 at 14:09)</a>:</h4>
<p>this is missing a PR I nominated today...</p>



<a name="174457247"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457247" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457247">(Aug 29 2019 at 14:09)</a>:</h4>
<blockquote>
<p>fix nounwind attribute logic <a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909">#63909</a></p>
</blockquote>



<a name="174457258"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457258" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457258">(Aug 29 2019 at 14:09)</a>:</h4>
<blockquote>
<p>Fix nested eager expansions in arguments of <code>format_args</code> <a href="https://github.com/rust-lang/rust/issues/63717" target="_blank" title="https://github.com/rust-lang/rust/issues/63717">#63717</a></p>
</blockquote>



<a name="174457266"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457266" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457266">(Aug 29 2019 at 14:09)</a>:</h4>
<blockquote>
<p>Don't access a static just for its size and alignment <a href="https://github.com/rust-lang/rust/issues/62982" target="_blank" title="https://github.com/rust-lang/rust/issues/62982">#62982</a></p>
</blockquote>



<a name="174457302"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457302" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457302">(Aug 29 2019 at 14:10)</a>:</h4>
<blockquote>
<p>fix nounwind attribute logic <a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909">#63909</a></p>
</blockquote>
<p>i-nominated for t-lang (beta-nominated for t-compiler)</p>



<a name="174457386"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457386" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457386">(Aug 29 2019 at 14:10)</a>:</h4>
<p>OK, I left that as just X since I guess there's still some decision making required</p>



<a name="174457452"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457452" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457452">(Aug 29 2019 at 14:11)</a>:</h4>
<blockquote>
<p>debuginfo: give unique names to closure and generator types <a href="https://github.com/rust-lang/rust/issues/63875" target="_blank" title="https://github.com/rust-lang/rust/issues/63875">#63875</a></p>
</blockquote>



<a name="174457505"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457505" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457505">(Aug 29 2019 at 14:12)</a>:</h4>
<p><span class="user-mention" data-user-id="124287">@mw</span> is that the one that was missing? the GH query seems to not be showing me closed things... even though I think it should...?</p>



<a name="174457546"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457546" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457546">(Aug 29 2019 at 14:12)</a>:</h4>
<p>OK that's a lot, I'm going to take a minute to read the PRs now :P</p>



<a name="174457578"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457578" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457578">(Aug 29 2019 at 14:13)</a>:</h4>
<p>that's the one, yes. I added the t-compiler tag just now.</p>



<a name="174457724"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457724" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457724">(Aug 29 2019 at 14:14)</a>:</h4>
<p>OK, I don't see any X marks</p>



<a name="174457737"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457737" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457737">(Aug 29 2019 at 14:14)</a>:</h4>
<p>wasn't <a href="https://github.com/rust-lang/rust/issues/62982" target="_blank" title="https://github.com/rust-lang/rust/issues/62982">#62982</a> already voted on before ?</p>



<a name="174457743"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457743" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457743">(Aug 29 2019 at 14:14)</a>:</h4>
<p>so I'm going to mark them all as accepted unless somebody complains :)</p>



<a name="174457772"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457772" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457772">(Aug 29 2019 at 14:15)</a>:</h4>
<blockquote>
<p>wasn't <a href="https://github.com/rust-lang/rust/issues/62982" target="_blank" title="https://github.com/rust-lang/rust/issues/62982">#62982</a> already voted on before ?</p>
</blockquote>
<p>if so, it's missing a beta-accepted label</p>



<a name="174457792"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457792" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457792">(Aug 29 2019 at 14:15)</a>:</h4>
<blockquote>
<p>fix nounwind attribute logic <a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909">#63909</a></p>
</blockquote>
<p>My X is for real there</p>



<a name="174457809"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457809" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457809">(Aug 29 2019 at 14:15)</a>:</h4>
<p>This is not getting beta accepted until T-Lang says that's OK</p>



<a name="174457998"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174457998" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174457998">(Aug 29 2019 at 14:17)</a>:</h4>
<p>Sorry, that one I already x'd off mentally</p>



<a name="174458002"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458002" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458002">(Aug 29 2019 at 14:17)</a>:</h4>
<p>I was referring to the others</p>



<a name="174458010"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458010" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458010">(Aug 29 2019 at 14:17)</a>:</h4>
<p>ah</p>



<a name="174458015"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458015" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458015">(Aug 29 2019 at 14:17)</a>:</h4>
<p>carry on =P</p>



<a name="174458026"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458026" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458026">(Aug 29 2019 at 14:17)</a>:</h4>
<blockquote>
<p>if so, it's missing a beta-accepted label</p>
</blockquote>
<p>oh, I think you are correct <span class="user-mention" data-user-id="124287">@mw</span>, it's because of a rollup maybe.</p>



<a name="174458220"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458220" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458220">(Aug 29 2019 at 14:20)</a>:</h4>
<p>OK, done with that.</p>



<a name="174458249"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458249" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458249">(Aug 29 2019 at 14:20)</a>:</h4>
<h1>Stable nominated</h1>
<p>None.</p>



<a name="174458271"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458271" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458271">(Aug 29 2019 at 14:20)</a>:</h4>
<h1><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta" target="_blank" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta">Stable to beta regressions</a></h1>



<a name="174458277"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458277" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458277">(Aug 29 2019 at 14:21)</a>:</h4>
<p>I didn't get to these in pre-triage but there seem to be a bunch</p>



<a name="174458304"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458304" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458304">(Aug 29 2019 at 14:21)</a>:</h4>
<p>Almost all opened by <span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span> =)</p>



<a name="174458321"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458321" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458321">(Aug 29 2019 at 14:21)</a>:</h4>
<p>and almost all will probably be fixed by petrochenkov =P</p>



<a name="174458327"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458327" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458327">(Aug 29 2019 at 14:21)</a>:</h4>
<p>and/or matthewjasper</p>



<a name="174458383"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458383" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458383">(Aug 29 2019 at 14:22)</a>:</h4>
<p>Let's spend a bit of time going through them</p>



<a name="174458387"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458387" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458387">(Aug 29 2019 at 14:22)</a>:</h4>
<h1>[1.38] Regression: custom attribute panicked <a href="https://github.com/rust-lang/rust/issues/63895" target="_blank" title="https://github.com/rust-lang/rust/issues/63895">#63895</a></h1>



<a name="174458436"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458436" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458436">(Aug 29 2019 at 14:22)</a>:</h4>
<p>Seems like this is because some procedural macro was relying on the output from pretty-printing</p>



<a name="174458454"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458454" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458454">(Aug 29 2019 at 14:23)</a>:</h4>
<p>Which I guess raises the question to what extent the byte representation of the input tokens is defined</p>



<a name="174458498"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458498" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458498">(Aug 29 2019 at 14:23)</a>:</h4>
<h1>[1.38] Regression: proc macro panicked <a href="https://github.com/rust-lang/rust/issues/63894" target="_blank" title="https://github.com/rust-lang/rust/issues/63894">#63894</a></h1>
<p>is similar but in that case we are retaining the <code>r#</code> in a string literal</p>



<a name="174458590"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458590" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458590">(Aug 29 2019 at 14:24)</a>:</h4>
<p>Sort of t-lang calls as well</p>



<a name="174458595"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458595" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458595">(Aug 29 2019 at 14:24)</a>:</h4>
<h1>[1.38] Regression: cannot determine resolution for the derive macro <code>Debug</code> <a href="https://github.com/rust-lang/rust/issues/63893" target="_blank" title="https://github.com/rust-lang/rust/issues/63893">#63893</a></h1>
<p>a subtle name resolution change</p>



<a name="174458596"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458596" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458596">(Aug 29 2019 at 14:24)</a>:</h4>
<blockquote>
<p>Which I guess raises the question to what extent the byte representation of the input tokens is defined</p>
</blockquote>
<p>I'd be inclined to close this for now; I agree the check is unreliable and badly written in that crate</p>



<a name="174458654"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458654" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458654">(Aug 29 2019 at 14:25)</a>:</h4>
<blockquote>
<p>is similar but in that case we are retaining the r# in a string literal</p>
</blockquote>
<p>Feels like a straight up bugfix</p>



<a name="174458719"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458719" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458719">(Aug 29 2019 at 14:26)</a>:</h4>
<p>Yes. I'm skimming a bit ahead</p>



<a name="174458731"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458731" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458731">(Aug 29 2019 at 14:26)</a>:</h4>
<h1>[1.38] Regression: expected module, found unresolved item <code>crate::mod</code> <a href="https://github.com/rust-lang/rust/issues/63891" target="_blank" title="https://github.com/rust-lang/rust/issues/63891">#63891</a></h1>



<a name="174458747"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458747" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458747">(Aug 29 2019 at 14:26)</a>:</h4>
<p>I <em>think</em> this is also a bug fix</p>



<a name="174458778"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458778" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458778">(Aug 29 2019 at 14:27)</a>:</h4>
<p>What is the policy here -- if something is expected breakage, do we just closure?</p>



<a name="174458783"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458783" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458783">(Aug 29 2019 at 14:27)</a>:</h4>
<p>*close?</p>



<a name="174458805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458805">(Aug 29 2019 at 14:27)</a>:</h4>
<p>we've done that before at least</p>



<a name="174458806"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458806" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458806">(Aug 29 2019 at 14:27)</a>:</h4>
<h1>[1.38] Regression: expected open delimiter <a href="https://github.com/rust-lang/rust/issues/63889" target="_blank" title="https://github.com/rust-lang/rust/issues/63889">#63889</a></h1>



<a name="174458810"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458810" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458810">(Aug 29 2019 at 14:27)</a>:</h4>
<p>e.g. that one</p>



<a name="174458943"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458943" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458943">(Aug 29 2019 at 14:28)</a>:</h4>
<h1>[1.38] Regression: cannot find macro <code>trace!</code> in this scope <a href="https://github.com/rust-lang/rust/issues/63888" target="_blank" title="https://github.com/rust-lang/rust/issues/63888">#63888</a></h1>
<p>is a genuine regr but has a pending fix</p>



<a name="174458951"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458951" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458951">(Aug 29 2019 at 14:28)</a>:</h4>
<p>assigned to <span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span></p>



<a name="174458989"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174458989" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174458989">(Aug 29 2019 at 14:29)</a>:</h4>
<h1>[1.38] Regression: attributes starting with <code>rustc</code> are reserved for use by the <code>rustc</code> compiler <a href="https://github.com/rust-lang/rust/issues/63887" target="_blank" title="https://github.com/rust-lang/rust/issues/63887">#63887</a></h1>



<a name="174459062"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459062" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459062">(Aug 29 2019 at 14:30)</a>:</h4>
<p>closing as expected</p>



<a name="174459081"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459081" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459081">(Aug 29 2019 at 14:30)</a>:</h4>
<h1>[1.38] Regression: lifetime name <code>'s</code> declared twice in the same scope <a href="https://github.com/rust-lang/rust/issues/63886" target="_blank" title="https://github.com/rust-lang/rust/issues/63886">#63886</a></h1>



<a name="174459084"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459084" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459084">(Aug 29 2019 at 14:30)</a>:</h4>
<p>I just dug up this: <a href="https://github.com/rust-lang/rfcs/blob/master/text/1122-language-semver.md" target="_blank" title="https://github.com/rust-lang/rfcs/blob/master/text/1122-language-semver.md">https://github.com/rust-lang/rfcs/blob/master/text/1122-language-semver.md</a></p>



<a name="174459091"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459091" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459091">(Aug 29 2019 at 14:30)</a>:</h4>
<p>is that our policy?</p>



<a name="174459108"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459108" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459108">(Aug 29 2019 at 14:30)</a>:</h4>
<p>it is, but it is rather open to interpretation re. handling</p>



<a name="174459145"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459145" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459145">(Aug 29 2019 at 14:31)</a>:</h4>
<p>This particular one is explained as a consequence of <a href="https://github.com/rust-lang/rust/pull/63083" target="_blank" title="https://github.com/rust-lang/rust/pull/63083">https://github.com/rust-lang/rust/pull/63083</a>, but it'd be maybe nice to see the code example in question.</p>



<a name="174459146"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459146" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459146">(Aug 29 2019 at 14:31)</a>:</h4>
<p>I think we had some other kind of document that said: help broken crates fix their code</p>



<a name="174459157"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459157" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459157">(Aug 29 2019 at 14:31)</a>:</h4>
<p>rustc bug fix procedure, you are probably referring to.</p>



<a name="174459182"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459182" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459182">(Aug 29 2019 at 14:31)</a>:</h4>
<p>this one: <a href="https://forge.rust-lang.org/rustc-bug-fix-procedure.html" target="_blank" title="https://forge.rust-lang.org/rustc-bug-fix-procedure.html">https://forge.rust-lang.org/rustc-bug-fix-procedure.html</a> ?</p>



<a name="174459235"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459235" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459235">(Aug 29 2019 at 14:32)</a>:</h4>
<p>It depends on a) how unreasonable it is to maintain this in the compiler (temporarily!), b) how easy it is to fix for folks, c) how many regressions there are</p>



<a name="174459245"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459245" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459245">(Aug 29 2019 at 14:32)</a>:</h4>
<p>anyway, don't let me hijack the meeting</p>



<a name="174459274"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459274" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459274">(Aug 29 2019 at 14:32)</a>:</h4>
<p>that's the one</p>



<a name="174459304"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459304" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459304">(Aug 29 2019 at 14:33)</a>:</h4>
<p>I'm going to revisit <a href="https://github.com/rust-lang/rust/issues/63886" target="_blank" title="https://github.com/rust-lang/rust/issues/63886">#63886</a> in a bit, leave it for now, but I think no immediate action from this team required</p>



<a name="174459307"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459307" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459307">(Aug 29 2019 at 14:33)</a>:</h4>
<h1>[1.38] Regression: failed to resolve: could not find <code>rustc_serialize</code> in <code>{{root}}</code> <a href="https://github.com/rust-lang/rust/issues/63885" target="_blank" title="https://github.com/rust-lang/rust/issues/63885">#63885</a></h1>



<a name="174459315"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459315" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459315">(Aug 29 2019 at 14:33)</a>:</h4>
<p>(I'm basically skimming to find things we should consider trying to assign)</p>



<a name="174459414"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459414" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459414">(Aug 29 2019 at 14:34)</a>:</h4>
<h1>[1.38] <code>#[bench]</code> accepted on stable but not beta <a href="https://github.com/rust-lang/rust/issues/63798" target="_blank" title="https://github.com/rust-lang/rust/issues/63798">#63798</a></h1>



<a name="174459421"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459421" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459421">(Aug 29 2019 at 14:34)</a>:</h4>
<p>lots of discussion there</p>



<a name="174459487"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459487" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459487">(Aug 29 2019 at 14:35)</a>:</h4>
<p>OK, I'll revisit those post meeting, but none of them jumped out at me</p>



<a name="174459496"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459496" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459496">(Aug 29 2019 at 14:35)</a>:</h4>
<p>Mostly policy questions and known outcomes</p>



<a name="174459516"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459516" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459516">(Aug 29 2019 at 14:35)</a>:</h4>
<blockquote>
<p>[1.38] #[bench] accepted on stable but not beta <a href="https://github.com/rust-lang/rust/issues/63798" target="_blank" title="https://github.com/rust-lang/rust/issues/63798">#63798</a></p>
</blockquote>
<p>For this one if we are going to fix this then I think a warning has to be there as well</p>



<a name="174459599"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459599" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459599">(Aug 29 2019 at 14:36)</a>:</h4>
<p>re. the changes that caused <a href="https://github.com/rust-lang/rust/issues/63887" target="_blank" title="https://github.com/rust-lang/rust/issues/63887">#63887</a>, where <code>rustc</code> is a reserved start of an attribute – do we have any sort of documentation about rustc-specific behaviour (compared to some other Rust compiler implementation)?</p>



<a name="174459641"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459641" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459641">(Aug 29 2019 at 14:36)</a>:</h4>
<p><span class="user-mention" data-user-id="121053">@varkor</span> sometimes; the rustc guide is the best place to fill more in</p>



<a name="174459654"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459654" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459654">(Aug 29 2019 at 14:36)</a>:</h4>
<p>although it feels reasonable to have some special-casing in the compiler, this is rustc-specific and probably wouldn't be handled in any "Rust specification"</p>



<a name="174459675"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459675" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459675">(Aug 29 2019 at 14:36)</a>:</h4>
<p>and it'd be nice to keep track of exactly what the differences are</p>



<a name="174459747"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459747" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459747">(Aug 29 2019 at 14:37)</a>:</h4>
<p>we did historically make <code>rustc_X</code> (pre-namespacing) nightly-only, but I don't see any RFC for that, I guess we just decided to do it</p>



<a name="174459814"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459814" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459814">(Aug 29 2019 at 14:38)</a>:</h4>
<p>(anyway I think it'd be reasonable to note in the lang spec myself, though we wouldn't want to document the behavior of said attributes; simply that the prefix is reserved)</p>



<a name="174459834"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459834" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459834">(Aug 29 2019 at 14:38)</a>:</h4>
<p>OK, it's 10:38, we've gone over the most burning categories, let's do some check-ins</p>



<a name="174459852"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459852" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459852">(Aug 29 2019 at 14:38)</a>:</h4>
<blockquote>
<p>I'll do wg-mir-opt updates</p>
</blockquote>
<p><span class="user-mention" data-user-id="124288">@oli</span> care to give an update?</p>



<a name="174459874"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459874" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459874">(Aug 29 2019 at 14:39)</a>:</h4>
<h1>wg-mir-opt update</h1>



<a name="174459891"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174459891" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174459891">(Aug 29 2019 at 14:39)</a>:</h4>
<p><span class="user-mention" data-user-id="121053">@varkor</span>  (and other rust compiler impls could also use the <code>rustc_</code> prefix ^,-)</p>



<a name="174460034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460034">(Aug 29 2019 at 14:40)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span>: agreed – though it would be good to decide/make note of whether this is a language detail or a compiler detail</p>



<a name="174460086"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460086" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460086">(Aug 29 2019 at 14:41)</a>:</h4>
<p><span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> got <code>Place2.0</code> (with slices) working, and it only regressed a very macro heavy memory test by 10 or 15%</p>



<a name="174460110"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460110" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460110">(Aug 29 2019 at 14:41)</a>:</h4>
<p>they're now checking out how to unregress that and then we're ready to merge</p>



<a name="174460124"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460124" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460124">(Aug 29 2019 at 14:41)</a>:</h4>
<p>(I'm inclined to say it is a language spec hack that all rust compilers must "support" :P)</p>



<a name="174460146"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460146" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460146">(Aug 29 2019 at 14:41)</a>:</h4>
<p><span class="user-mention" data-user-id="125250">@Wesley Wiser</span> split our promoted items out of the <code>mir::Body</code> in order to prevent cycles in our optimization pipeline</p>



<a name="174460227"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460227" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460227">(Aug 29 2019 at 14:42)</a>:</h4>
<p>we now have a <code>mir_promoted</code> query that gives you all promotes for a <code>DefId</code></p>



<a name="174460244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460244">(Aug 29 2019 at 14:42)</a>:</h4>
<p>while <code>mir_optimized</code> gives you the <code>mir::Body</code> directly</p>



<a name="174460252"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460252" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460252">(Aug 29 2019 at 14:42)</a>:</h4>
<p>that's it from WG-mir-opt for now</p>



<a name="174460256"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460256" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460256">(Aug 29 2019 at 14:42)</a>:</h4>
<p>that's awesome</p>



<a name="174460301"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460301" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460301">(Aug 29 2019 at 14:43)</a>:</h4>
<p>it'd be good to talk -- not in this mtg -- about the overall plan. e.g., do we have specific optimizations we are working towards first?</p>



<a name="174460308"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460308" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460308">(Aug 29 2019 at 14:43)</a>:</h4>
<p>might be an interesting thing to do a design meeting about</p>



<a name="174460320"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460320" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460320">(Aug 29 2019 at 14:43)</a>:</h4>
<p>note that the promoted change also makes sure that inlining doesn't clone promoteds, so we preemptively eliminated memory regressions in the inliner that could happen in the future</p>



<a name="174460339"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460339" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460339">(Aug 29 2019 at 14:43)</a>:</h4>
<p>right now we're just looking at <code>const_prop</code> wrt optimizations</p>



<a name="174460391"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460391" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460391">(Aug 29 2019 at 14:44)</a>:</h4>
<p>we talked at the all hands about other optimizations</p>



<a name="174460395"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460395" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460395">(Aug 29 2019 at 14:44)</a>:</h4>
<p>seems like a reasonable choice; that or inlinign</p>



<a name="174460431"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460431" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460431">(Aug 29 2019 at 14:44)</a>:</h4>
<p>oh, you mean which ones to enable by default at some point?</p>



<a name="174460438"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460438" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460438">(Aug 29 2019 at 14:44)</a>:</h4>
<p>OK, to what extent is there a plan with "known steps"? I guess maybe I need to review the minutes from all hands and refresh my memory :) (I wasn't at those meetings as I recall)</p>



<a name="174460455"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460455" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460455">(Aug 29 2019 at 14:45)</a>:</h4>
<p>no, I guess that's a separate decision</p>



<a name="174460465"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460465" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460465">(Aug 29 2019 at 14:45)</a>:</h4>
<p>I meant more like "what are we focusing our engineering efforts on"</p>



<a name="174460470"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460470" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460470">(Aug 29 2019 at 14:45)</a>:</h4>
<p>yea, iirc we just discussed what we can do</p>



<a name="174460523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460523">(Aug 29 2019 at 14:45)</a>:</h4>
<p>right now it's mostly driven by <span class="user-mention" data-user-id="125250">@Wesley Wiser</span> who's fixing up const_prop to be equal in capabilites to const eval</p>



<a name="174460570"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460570" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460570">(Aug 29 2019 at 14:46)</a>:</h4>
<p>very interesting</p>



<a name="174460588"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460588" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460588">(Aug 29 2019 at 14:46)</a>:</h4>
<p>(while deduplicating logic at the same time)</p>



<a name="174460592"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460592" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460592">(Aug 29 2019 at 14:46)</a>:</h4>
<p>is it trying to make use or miri?</p>



<a name="174460610"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460610" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460610">(Aug 29 2019 at 14:46)</a>:</h4>
<p>we're essentially running const eval on polymorphic non-const MIR</p>



<a name="174460629"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460629" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460629">(Aug 29 2019 at 14:46)</a>:</h4>
<p>and ignore a bunch of errors and report a bunch of other errors as warnings</p>



<a name="174460639"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460639" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460639">(Aug 29 2019 at 14:46)</a>:</h4>
<p>and anyhting that succeeds, is written back to the MIR</p>



<a name="174460665"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460665" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460665">(Aug 29 2019 at 14:47)</a>:</h4>
<p>neat</p>



<a name="174460708"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460708" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460708">(Aug 29 2019 at 14:47)</a>:</h4>
<p>OK. Thanks for the updates, <span class="user-mention" data-user-id="124288">@oli</span> !</p>



<a name="174460730"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460730" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460730">(Aug 29 2019 at 14:47)</a>:</h4>
<h1>wg-nll</h1>



<a name="174460771"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460771" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460771">(Aug 29 2019 at 14:48)</a>:</h4>
<p>maybe we can discuss this a bit briefly? I don't think there's anyone to give a dedicated report</p>



<a name="174460789"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460789" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460789">(Aug 29 2019 at 14:48)</a>:</h4>
<p>We closed a few fixed-by-NLL soundness holes recently</p>



<a name="174460791"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460791" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460791">(Aug 29 2019 at 14:48)</a>:</h4>
<p>but last I heard, we had done a crater run, and we are basically looking at how to encourage migration and warning fixes</p>



<a name="174460814"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460814" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460814">(Aug 29 2019 at 14:48)</a>:</h4>
<p>and then we're trying to stabilize bind-by-move-pattern-guards</p>



<a name="174460828"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460828" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460828">(Aug 29 2019 at 14:48)</a>:</h4>
<p>and then there's the aforementioned crater run</p>



<a name="174460834"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460834" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460834">(Aug 29 2019 at 14:48)</a>:</h4>
<p>yes -- that's right -- so we've also been doing the migration in a more fine-grained way</p>



<a name="174460842"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460842" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460842">(Aug 29 2019 at 14:48)</a>:</h4>
<p>I'm doing a new crater run</p>



<a name="174460857"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460857" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Pietro Albini <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460857">(Aug 29 2019 at 14:49)</a>:</h4>
<p>(poor crater queue...)</p>



<a name="174460882"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460882" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460882">(Aug 29 2019 at 14:49)</a>:</h4>
<p>what's blocking bind-by-move right now?</p>



<a name="174460898"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460898" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460898">(Aug 29 2019 at 14:49)</a>:</h4>
<p>crater rollups when</p>



<a name="174460902"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174460902" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174460902">(Aug 29 2019 at 14:49)</a>:</h4>
<p><span class="user-mention" data-user-id="121053">@varkor</span> a single checkbox</p>



<a name="174461044"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461044" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461044">(Aug 29 2019 at 14:50)</a>:</h4>
<p>OK. Seems like we should get moving on the "stronger steps to encourage fixes in dependencies" conversation, but that's for later.</p>
<p>( And yes <span class="user-mention" data-user-id="126931">@centril</span> I remember your PR :P )</p>



<a name="174461100"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461100" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461100">(Aug 29 2019 at 14:51)</a>:</h4>
<p>(Same issue came up in one of the other regressions too, as I recall...)</p>



<a name="174461122"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461122" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461122">(Aug 29 2019 at 14:51)</a>:</h4>
<h1>wg-parallel-rustc</h1>



<a name="174461174"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461174" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461174">(Aug 29 2019 at 14:52)</a>:</h4>
<p>so <span class="user-mention" data-user-id="116010">@Aaron Turon</span> has been doing an audit of the various changes, looking particularly as shared state and lock semantics</p>



<a name="174461198"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461198" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461198">(Aug 29 2019 at 14:52)</a>:</h4>
<p>I don't think he's awake yet :)</p>



<a name="174461207"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461207" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461207">(Aug 29 2019 at 14:52)</a>:</h4>
<p>you can see <a href="#narrow/stream/187679-t-compiler.2Fwg-parallel-rustc/topic/going.20forward/near/173405208" title="#narrow/stream/187679-t-compiler.2Fwg-parallel-rustc/topic/going.20forward/near/173405208">his comment here</a></p>



<a name="174461218"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461218" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461218">(Aug 29 2019 at 14:52)</a>:</h4>
<p>in particular, he was looking into some issues such as fine-grained locking that could give rise to deadlocks</p>



<a name="174461224"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461224" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461224">(Aug 29 2019 at 14:52)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span>  "Do you have a moment to talk about our lord and savior PR <a href="https://github.com/rust-lang/rust/issues/59658" target="_blank" title="https://github.com/rust-lang/rust/issues/59658">#59658</a> ?" xD</p>



<a name="174461261"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461261" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461261">(Aug 29 2019 at 14:53)</a>:</h4>
<p>the idea was to spin out refactorings</p>



<a name="174461278"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461278" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461278">(Aug 29 2019 at 14:53)</a>:</h4>
<p>to try and eliminate locks and shared mutable state outside the query system, ideally, or to do more targeted fixes, secondarily</p>



<a name="174461308"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461308" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461308">(Aug 29 2019 at 14:53)</a>:</h4>
<p>that said, I don't know how much progress he's made lately; probably not much last week owing to rust conf</p>



<a name="174461375"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461375" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461375">(Aug 29 2019 at 14:54)</a>:</h4>
<p>I guess I don't have much to add beyond that</p>



<a name="174461405"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461405" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461405">(Aug 29 2019 at 14:54)</a>:</h4>
<p>End of meeting? Any final comments?</p>



<a name="174461445"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461445" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461445">(Aug 29 2019 at 14:55)</a>:</h4>
<blockquote>
<p>Any final comments?</p>
</blockquote>
<p>Thanks all!</p>



<a name="174461453"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461453" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461453">(Aug 29 2019 at 14:55)</a>:</h4>
<p>(Also, I'm going to spend a bit of time going over nominated issues + beta regressions, I think, in the pre-meeting triage stream, at some point today --- maybe now :)</p>



<a name="174461467"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461467" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461467">(Aug 29 2019 at 14:55)</a>:</h4>
<p><span class="user-mention" data-user-id="125250">@Wesley Wiser</span> are you going to summarize these minutes?</p>



<a name="174461477"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461477" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461477">(Aug 29 2019 at 14:56)</a>:</h4>
<p>I'm really glad we have <span class="user-mention" data-user-id="116010">@Aaron Turon</span> back working on the compiler :D</p>



<a name="174461526"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461526" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> varkor <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461526">(Aug 29 2019 at 14:56)</a>:</h4>
<p><span class="user-mention" data-user-id="124288">@oli</span>: it sounds like these const prop changes lay the groundwork for more sophisticated symbolic evaluation..?</p>



<a name="174461555"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461555" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461555">(Aug 29 2019 at 14:56)</a>:</h4>
<p>not really, we don't have symbols yet</p>



<a name="174461584"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461584" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461584">(Aug 29 2019 at 14:56)</a>:</h4>
<p>Yes, but it will probably be later tonight or tomorrow before they're up.</p>



<a name="174461641"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174461641" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174461641">(Aug 29 2019 at 14:57)</a>:</h4>
<p><span class="user-mention" data-user-id="132916">@Christian Poveda</span> has started some symbol work a while back, but they are currently busy with other things I believe</p>



<a name="174462235"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174462235" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174462235">(Aug 29 2019 at 15:03)</a>:</h4>
<blockquote>
<p>I'm really glad we have @Aaron Turon back working on the compiler :D</p>
</blockquote>
<p>I only wish the breaks between all those conferences and all-hands aturon has to participate in were longer.</p>



<a name="174462729"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174462729" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Christian Poveda <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174462729">(Aug 29 2019 at 15:08)</a>:</h4>
<blockquote>
<p><span class="user-mention silent" data-user-id="132916">Christian Poveda</span> has started some symbol work a while back, but they are currently busy with other things I believe</p>
</blockquote>
<p>If you have any evil plans regarding symbolic execution count me in :D</p>



<a name="174466474"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174466474" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174466474">(Aug 29 2019 at 15:47)</a>:</h4>
<blockquote>
<p>We've talked on and off about this idea of an "ICE-breaker" effort -- I think it would make sense to try and "repurpose" <span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span> to help out with tracking and resolving this issues? This probably doesn't mean that much but maybe we can promote the concept and get a few more people beyond <span class="user-mention silent" data-user-id="133224">Nikita Popov</span> and <span class="user-mention silent" data-user-id="123586">nagisa</span>, and create an official github team so it can be easily cc'd</p>
</blockquote>
<p>Good morning! IMO the concept between WG-llvm and ICE breakers differs substantially enough that people interested in the first might not be interested in the 2nd or vice vrsa.</p>



<a name="174467516"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174467516" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174467516">(Aug 29 2019 at 16:01)</a>:</h4>
<p><span class="user-mention" data-user-id="123586">@nagisa</span> good feedback; I'm happy to create a second group. I sort of want it to include the term "ICE-breakers" anyway</p>



<a name="174467531"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-29%20%2354818/near/174467531" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-29.20.2354818.html#174467531">(Aug 29 2019 at 16:01)</a>:</h4>
<p>I'll make a separate topic to discuss perhaps</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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